elmore



G. H. ELMRE.

APPLICATION man 050.2319l9.

1,387,37@ Pandfmg. 9,1921.

iwf/M7771 K gnk/024Mo@ @M dm SH01 e145 UNITED STATES PATENT yrinuncia.`

GUY El'illllORl?, 0F SWARTHMORE, PENNSYLVANIA.

J'IG.

Specification of Letters Patent.

' Patented Aug. 9, 1921.

Application led December 23, 1919. Serial No. 346,812.

'the discharge of the heavier materials separated from the lighter materials in the jig, such heavier materials being, in the case of coal washers, the slate and bone. The control device is of that type dependent upon the use of a fioat working in the jig bed. The discharge is controlled by a movable platform or leaf which retains a varying mass or accumulation of the discharging heavy material against the outer side of the discharge opening from the jig. The platform is moved by the fioat to vary the amount of material so maintainedand hence to exert a varying resistance to the outflow of further material from the jig bed.

The invention is applicable to various known types of jig, but is shown applied to a type of coal washing jig now in extensive use.

Referring to the drawings Figure 1 is a vertical section through the jig `tank showing the piston and screenchambers; a part of the jig tank is broken away to show the slate discharge elevator;

Fig. 2 is an enlarged fragmentary view similar to a portion of Fig. 1, showing the control mechanism ina slightly different position; and n Fig. 3 is a perspective view of the discharge platform and the lever connection.

Details of the jig not essential to the invention are illustrated only generally. In the drawingl 4 represents the jig tank structure. 5 is therhutch, 6 is the hutch discharge valve (here shown open) and 7 is the plunger chamber. Working in `the plunger chamber 7 is the plunger 8 which is reciprocated by the eccentric 9. The plunger chamber 7 communicates with the hutch5 which extends under it and also under the screen 10. The construction of the screen 10 is not a feature of the present invention and almost any usual screen construction may be used in lieu of the offset screen shown.

The feed of material to the. jig is to the space behind the partition 11. Such material ows under the partition 11 and down the inclined screen toward its discharge side. The discharge side of the screen is bounded by a dam 12, over the top of which ythe washed coal flows. After discharge the coal passes down a dewatering screen 13. l

The off-flowing water is directed by the plate 14 to any suitable launder. The lower edge of the dam 12 is spaced above the discharge edge of the screen l0 to leave an opening for the discharge of the slate and bone. This discharge opening preferably,

but not necessarily, extends the entire width t of the screen 10, and its height is variable by means of a vertically adjustable gate 15 which slides in guides on the dam 12 and which may be set by handle 16 to give any desired height of discharge opening up to the maximum height under the dam 12.

Hinged at 17 below "the discharge edge of screen 10 and outside the opening under the yadjustable gate 15 is a platform or leaf 18 which is approximately coextensive in length with the discharge opening. This leaf 18 is connected by a link 19 to a lever 20 fulcrumed at 21 on a. bracket 22 attached to the jig tank. The link 19 passes through theplate 14 and dewatering screen 13, loss of water through the-plate 14 being prevented by a tube 23, connected to the upper surface of late 14, surrounding the rod 19 and extendlng above the water level in the one side of the fulcrum 21, and the lever is forked at the opposite side of the fulcrum. One arm of the fork carries an adjustable counter-.weight 24and the other has a pin and slot connection 25 with a rod 26 which carries a float 27 working in the jig bed. The float chosen for illustration is a disk 27 sliding freely in but filling a vertical tubular guide 28. ny other type of fioat may be used. The rod 26 is guided in a head 29 fixed in the upper end of the tubular guide 28. The tubular guide 28 may be supported in any suitable manner but is shown connected to the dam 12.

The pin and slot connection between the lever 20 and the rod 26 is adjustable by inserting the pin in any one of the series of holes 30 shown in the rod 26. The length of the link 19 is adjustable by means of a turn-buckle 31. These two adjustments stratify, the coal risino ers of bone and slate beneath it.

permit the float 27 and the platform 18 to be individually adjusted with reference to the limits of motion permitted the lever 20.

Slate and bone discharged under the gate 15 and flowing over the platform 18 fall upon an inclined defiector plate 32 down which they slide to the chain elevator 33 which draws them out of the jig tank. This chain discharge is familiar to those skilled in the art. f

In the operation of the device the jig tank is kept filled with Water, the eccentric 9 is rotated to reciprocate the plunger 8. The coal to be washed is fed behind the partition 11. The float 27 andgate 15 and the counter-weight 24 are adjusted according to the nature of the coal to be washed, and the handle 16 is set to give the proper discharge opening. These adjustments are determined by experiment and will vary somewhat according to local conditions and the references of the operator. Coal to be was ed flows under the partition 11 and the upward pulses of Water forced by the plunger 8 through the screen 10 will cause it to to the top with layne float will automatically assume a position approximatelyv coincident to the upper surface of the bone stratum. As the strata of slate and bone become thicker the oat will rise and the platform 18 will be lowered., The

bone and slate retained on the platform 18` flow gradually over its free edge permitting an accelerated discharge of bone and slate from the jig. When the platform 18 is raised by the fall of the float the bone and slate will accumulate in a deeper and more resistant mass, thusretardin the discharge of further bone and slate. t will be noted that the platform 18 will have a gradually varying retarding effect as the platform moves between its extreme positions, that it consumes no power and that it responds instantly to the movements of the float.

While I have shown a disk and guide tube as the float element in this device it will be understood that I am not confined to this specilic construction, but may use other types of float. Various changes in the construction of the jig and in the details of arrangement of the discharge mechanism, including changes in the form of the platform, are possible and are contemplated by me. or example, the same principle is applicable for the control of the discharge of metallic concentrates from jig beds, but such use will obviously require a different proportioning of the Iparts to suit the different type of jig. ence I do not limit myself to the structure shown.

What is claimed is 1. The combination with a jig having a screen and a constantly open discharge opening for heavier materials at a side of said screen, of a plate over which the material after passage through said discharge opening flows; and means serving to vary the inclination of said plate to vary the rate of flow of material thereover. 70

2. The combination with a jig having a screen and a constantly open discharge opening for heavier materials at a side of said Yscreen, of a plate over which the material after passage through said discharge opening Hows; and automatic means, responsive to the condition of the jig bed serving to vary the inclination of said plate to vary the rate of flow of material thereover. 3. The combination with a jig having a screen and a constantly o en discharge opening for heavier material) at a side of said screen, of a movable support serving to maintain against the discharge side of said opening a mass of discharged material variable in amount by the movement of said support; andautomatic means responsive to the condition of the jig bed and serving to move said support.

4. The combination with a jig having a screen and a constantly open discharge opening for heavier material at a side of said screen, of a ioat workin in the bed of material on said screen; andg a movable support operatively connected with said float, controlled thereby and serving to maintain against the discharge side of said discharge opening a variable mass of discharged materia 5. The combination with a jig having a screen and a discharge opening for heavier material at a side of said screen, of a float working in the bed of material on said screen; a plate hinged adjacent the edge of said screen beneath and beyond said discharge opening and serving 1n different angular positions to maintain drifferent amounts of discharged material* against the discharge side of said discharge opening; and operative connections between said 110 float and plate serving upon the rise of said ioat to move said plate to reduce the amount of retained material.

6. The combination with a jig having a screen and a constantly open discharge open- 115 ing for heavier materials at a side of said screen, of a float working in the bed of material on said screen; a support serving to maintain a mass of discharged material against the discharge side of said opening, 12,0 said support being movable to vary the i amount of material so maintained; connections between said float and support serving to move the support in response to changes in the position of the float, and means for over which the material after passage through said discharge opening Hows; and connections between said float and plate serving to impart to said plate diiferent inclinations corresponding to different positions assumed Vby said iioat, the varying inclination of the plate serving to control the rate of iiow of material thcreover.

8. The combination With a ,jig having a screen and a constantly opendischarge opening for the heavier materials; of a support serving to maintain an obstructive mass of discharged material against the discharge side of said opening; and means responsive to the condition of the jig bed for varying 15 the obstructive-effect of said mass.

9. The combination with a jig. having a screen and a constantly open discharge opening for the heavier materials; of a support serving to maintain an obstructive mass of 20 discharged material against the discharge side of said opening, and means responsive to the condition of the jig bed serving to vary the amount of material so maintained.

In testimc-ny whereof I have signed my 25 name to this specification.

GUY H. ELMORE. 

